The PetZoom EMSON DIV. OF E. MISHON 8140 Sonic Pet Trainer is a portable repeller designed specifically for training dogs. Made by the brand PetZoom and originating from China, this model (8140) is a sonic trainer that helps in obedience training by emitting ultrasonic frequencies to deter pets from undesired behaviors. Ideal for pet owners looking for a compact and easy-to-use tool to assist in their training routines with their furry companions.